Ok, so there are different kinds of inheritance in GCCs. For starters, Pineapple is a mix of Yellow-sided and Cinnamon, both of which are sex linked mutations (if the father is cinnamon, the daughters will be cinnamon, if the mother is yellow sides the sons will be yellow-sided.) and turquoise is a recessive gene, not sex linked. So in order for the babies to be turquoise both parents need to carry the gene.
One note - be sure your birds are actually pineapple and not something else. Your pineapple may be cinnamon. Check under the wings, if the underwing feathers are green it is a cinnamon, if they are yellow it is a pineapple. I have never seen a pineapple turquoise, I would LOVE LOVE LOVE to see pics, I am very interested to see how it compares to a yellow-sided turquoise.